package com.atguigu.eduservice.listener;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.atguigu.eduservice.entity.EduSubject;
import com.atguigu.eduservice.entity.excel.SubjectData;
import com.atguigu.eduservice.service.EduSubjectService;
import com.atguigu.servicebase.excptionhandler.GuliException;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;

import java.util.Map;

/**
 * @author hjt
 * @date 2021年 04月 12日
 */
public class SubjectListener extends AnalysisEventListener<SubjectData> {
    //监听器不能交给spring管理 不能注入其他对象
    //不能实现数据库操作

    public EduSubjectService subjectService;

    public SubjectListener() {
    }

    public SubjectListener(EduSubjectService subjectService) {
        this.subjectService = subjectService;
    }

    /**
     * 读取excel中数据，一行一行读取
     *
     * @param subjectData
     * @param analysisContext
     */
    @Override
    public void invoke(SubjectData subjectData, AnalysisContext analysisContext) {
        if (subjectData == null) {
            throw new GuliException(20001, "文件数据为空");
        }
        //判断一级分类是否重复
        EduSubject existOneSubject = existOneSubject(subjectService, subjectData.getOneSubjectName());
        if (existOneSubject == null) {
            existOneSubject = new EduSubject();
            existOneSubject.setParentId("0");
            existOneSubject.setTitle(subjectData.getOneSubjectName());//设置一级分类名称
            subjectService.save(existOneSubject);
        }
        //获取一级分类的ID值
        String pid = existOneSubject.getId();
        //判断二级分类是否重复
        EduSubject existTwoSubject = existTwoSubject(subjectService, subjectData.getTwoSubjectName(), pid);
        if (existTwoSubject == null) {
            existTwoSubject = new EduSubject();
            existTwoSubject.setParentId(pid);
            existTwoSubject.setTitle(subjectData.getTwoSubjectName());//设置二级分类名称
            subjectService.save(existTwoSubject);
        }
    }

    /**
     * 判断一级分类不能重复
     */
    private EduSubject existOneSubject(EduSubjectService subjectService, String name) {
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title", name);
        wrapper.eq("parent_id", "0");
        EduSubject oneSubject = subjectService.getOne(wrapper);
        return oneSubject;
    }

    /**
     * 判断二级分类不能重复
     */
    private EduSubject existTwoSubject(EduSubjectService subjectService, String name, String pid) {
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title", name);
        wrapper.eq("parent_id", pid);
        EduSubject twoSubject = subjectService.getOne(wrapper);
        return twoSubject;
    }

    /**
     * 读取表头信息
     *
     * @param headMap
     * @param context
     */
    @Override
    public void invokeHeadMap(Map<Integer, String> headMap, AnalysisContext context) {
        System.out.println("表头信息：" + headMap);
    }

    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {

    }
}
